13818454 ÷ 686 
We want to divide 13818454 by 686.

Step 1:
1 divided by 686 is 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 686

Let's proceed to step 2:
When dividing 13 by 686, we get 0 with a remainder of 13.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 13 to get 13.
Bring next digit (8) of the dividend behind the 13 and repeat the process: 138 / 686

On to step 3:
If we divide 138 by 686, we get 0 and a remainder of 138.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 138 after subtracting 0 from 138.
Append the next digit (1) from the dividend to 138 and continue with: 1381 / 686

Moving on to step 4:
If we divide 1381 by 686, we get 2 and a remainder of 9.
Use 2 as the next digit of our solution. 
Result so far: 2.0
The remainder is 9 after subtracting 1372 from 1381.
Append the next digit (8) from the dividend to 9 and continue with: 98 / 686

Step 5:
The number 686 fits into 98 0 times, leaving a remainder of 98.
Put 0 as the next digit of the answer. 
Result so far: 20.0
If we subtract 0 from 98, we get 98.
Fetch the next digit (4) from the dividend, attach it to 98 and continue: 984 / 686

Moving on to step 6:
686 can be fit into 984 1 times, resulting in a remainder of 298.
The number 1 becomes the next digit in our result. 
Result so far: 201.0
Deduct 686 from 984 and we're left with 298.
Append the next digit (5) from the dividend to 298 and continue with: 2985 / 686

Let's proceed to step 7:
When dividing 2985 by 686, we get 4 with a remainder of 241.
The next digit of our result is 4. 
Result so far: 2014.0
Subtracting 2744 from 2985 leaves us with 241.
Append the next digit (4) from the dividend to 241 and continue with: 2414 / 686

Step 8:
If we divide 2414 by 686, we get 3 and a remainder of 356.
Put 3 as the next digit of the answer. 
Result so far: 20143.0
Deduct 2058 from 2414 and we're left with 356.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3560, and continue the process.

Advancing to step 9:
686 goes into 3560 5 times with a remainder of 130.
Record the quotient 5 as the next digit in the result. 
Result so far: 20143.5
If we take 3430 away from 3560, we end up with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Advancing to step 10:
686 can be fit into 1300 1 times, resulting in a remainder of 614.
Write down 1 as next digit of the result. 
Result so far: 20143.51
If we take 686 away from 1300, we end up with 614.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6140, and continue the process.

On to step 11:
686 goes into 6140 8 times with a remainder of 652.
The next digit of our result is 8. 
Result so far: 20143.518
The remainder is 652 after subtracting 5488 from 6140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6520, and continue the process.

On to step 12:
686 can be fit into 6520 9 times, resulting in a remainder of 346.
The next digit of our result is 9. 
Result so far: 20143.5189
The remainder is 346 after subtracting 6174 from 6520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3460, and continue the process.

Going ahead to step 13:
686 can be fit into 3460 5 times, resulting in a remainder of 30.
The next digit of our result is 5. 
Result so far: 20143.51895
The remainder is 30 after subtracting 3430 from 3460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 14:
686 can be fit into 300 0 times, resulting in a remainder of 300.
The next digit of our result is 0. 
Result so far: 20143.51895
If we subtract 0 from 300, we get 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Advancing to step 15:
686 can be fit into 3000 4 times, resulting in a remainder of 256.
The next digit of our result is 4. 
Result so far: 20143.5189504
The remainder is 256 after subtracting 2744 from 3000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Step 16:
686 can be fit into 2560 3 times, resulting in a remainder of 502.
The number 3 becomes the next digit in our result. 
Result so far: 20143.51895043
Deduct 2058 from 2560 and we're left with 502.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5020, and continue the process.

The final result is 20143.51895043 with a remainder of 5.02e-07.